7.1.1

Communities

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Ecosystems

An ecosystem is made up of living (biotic) and non-living (abiotic) parts. In an ecosystem, there are different levels of organisation:

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Individuals

  • Individual organisms are the smallest part of an ecosystem.
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Populations

  • Populations of individual organisms make up a single species.
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Communities

  • Communities are made up of populations of different species.

Competition for Resources

Organisms need resources from both abiotic and biotic parts of an ecosystem to survive and reproduce. But resources are not infinite. Different species and different individuals compete for resources.

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Competition between plants

  • Plants often compete for water and mineral ions (minerals) from the soil, as well as for light and space.
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Competition between animals

  • Animals often compete for food, mates and territory.

Jump to other topics

1Cell Biology

2Organisation

2.1Principles of Organisation

2.2Enzymes

2.3Circulatory System

2.4Non-Communicable Diseases

2.5Plant Tissues, Organs & Systems

3Infection & Response

4Bioenergetics

5Homeostasis & Response

6Inheritance, Variation & Evolution

7Ecology

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